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<p>This study investigates the catalytic co-pyrolysis of two tropical hardwoods Ayous (<i>Triplochiton scleroxylon</i>) and Sapelli (<i>Entandrophragma cylindricum</i>) to produce a high-quality bio-oil under a bifunctional H-ZSM-5/Ni-Mo/MgO catalyst. Experimental results show that catalyst incorporation enhances bio-oil yields up to 57.3 wt% with a substantially improved energy density (28&#xa0;MJ/kg), a reduced oxygen content (18 wt%), an increase of fixed-carbon content (70–75 wt%) and a higher proportion of aromatic hydrocarbons (38%). Thermogravimetric (TGA/DTG) analyses reveal accelerated devolatilization kinetics, with apparent activation energies lowered to 29–35&#xa0;kJ/mol under catalysis. GC–MS and FTIR analysis confirm effective deoxygenation and stabilization of the bio-oil. Life-cycle assessment indicates a 32% decrease in greenhouse gas emissions per megajoule produced compared to diesel, while co-produced biochar provides long-term carbon sequestration benefits. Together, these findings highlight the catalytic co-pyrolysis of tropical hardwoods as a robust, sustainable strategy for valorizing underutilized forest residues into renewable liquid biofuels with higher fuel properties and a reduced environmental footprint.</p>

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Catalytic Co-Pyrolysis of Sawdust from Tropical Hardwoods Over Ni–Mo/MgO–H-ZSM-5 for Enhanced Bio-oil Energy Yield and Life Cycle Assessment

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Davy Kaoke Fiwa,
  • Djakaou Iya-sou,
  • Albert Veved,
  • Hassana Boukar,
  • Emmanuel Talla

摘要

This study investigates the catalytic co-pyrolysis of two tropical hardwoods Ayous (Triplochiton scleroxylon) and Sapelli (Entandrophragma cylindricum) to produce a high-quality bio-oil under a bifunctional H-ZSM-5/Ni-Mo/MgO catalyst. Experimental results show that catalyst incorporation enhances bio-oil yields up to 57.3 wt% with a substantially improved energy density (28 MJ/kg), a reduced oxygen content (18 wt%), an increase of fixed-carbon content (70–75 wt%) and a higher proportion of aromatic hydrocarbons (38%). Thermogravimetric (TGA/DTG) analyses reveal accelerated devolatilization kinetics, with apparent activation energies lowered to 29–35 kJ/mol under catalysis. GC–MS and FTIR analysis confirm effective deoxygenation and stabilization of the bio-oil. Life-cycle assessment indicates a 32% decrease in greenhouse gas emissions per megajoule produced compared to diesel, while co-produced biochar provides long-term carbon sequestration benefits. Together, these findings highlight the catalytic co-pyrolysis of tropical hardwoods as a robust, sustainable strategy for valorizing underutilized forest residues into renewable liquid biofuels with higher fuel properties and a reduced environmental footprint.